AI Article Synopsis
- Recent studies show that chromatin movement is influenced by transcription, but the specifics of how transcription affects chromatin dynamics remain unclear.
- Using CRISPR-labeling to target telomeric DNA, researchers found that transcription inhibitors can either increase chromatin movement or decrease it depending on their mode of action.
- The study suggests that changes in chromatin mobility are linked to its rigidity and that confinement within the nucleus also affects chromatin dynamics, with increased pressure leading to reduced movement.
Article Abstract
Recent studies with single-particle tracking in live cells have revealed that chromatin dynamics are directly affected by transcription. However, how transcription alters the chromatin movements followed by changes in the physical properties of chromatin has not been elucidated. Here, we measured diffusion characteristics of chromatin by targeting telomeric DNA repeats with CRISPR-labeling. We found that transcription inhibitors that directly block transcription factors globally increased the movements of chromatin, while the other inhibitor that blocks transcription by DNA intercalating showed an opposite effect. We hypothesized that the increased mobility of chromatin by transcription inhibition and the decreased chromatin movement by a DNA intercalating inhibitor is due to alterations in chromatin rigidity. We also tested how volume confinement of nuclear space affects chromatin movements. We observed decreased chromatin movements under osmotic pressure and with overexpressed chromatin architectural proteins that compact chromatin.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9302598 | PMC |
| http://dx.doi.org/10.3389/fcell.2022.822026 | DOI Listing |
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